Variations of nitrogen nutrition efficiency in different rice germplasm types Classification, Identification and Evaluation of Nitrogen Nutrition Efficiencies in Rice Germplasms at Seedling Stage Analysis of combining ability of cytoplasmic effects on nitrogen use efficiency of hybrid rice Advancement of QTL analysis for traits associated to N, P and K utilization Genetic analysis on the boron nutrition efficiency of rapeseed Genotypic variations of yields and nitrogen nutrition efficiencies in Bt transgenic cotton